Retrofit Locking System with Angled Tongue for Prying Resistance
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Solution Overview
Problem
Existing locking systems for windows and doors are vulnerable to forced entry and difficult to retrofit, as they can be easily levered open and require extensive effort to replace mushroom head pins, which often leads to costly replacements of entire fittings.
Innovation Solution
A locking system with a cuboid attachment featuring a blind hole and angled tongue for secure fastening to existing pins, along with an adapter for mushroom head pins, and a locking piece with a receiving pocket for enhanced force absorption, allowing for easy retrofitting and improved resistance against prying open.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mushroom-headed locking bolts are used to improve resistance against prying, then security is improved, but the complexity of retrofitting increases significantly
Solution Approach 1:
The attachment is a cuboid structure that encloses the existing roller, bolt, or mushroom-headed locking bolt within its blind hole. The existing locking bolt is nested inside the attachment, allowing the attachment to provide enhanced security features while accommodating the original component. This nesting approach enables retrofitting without removing the existing hardware.
Solution Approach 2:
The locking system is divided into separate components: the existing locking bolt and the new attachment. The attachment is a distinct cuboid component with a blind hole that receives the existing bolt, allowing independent installation and replacement of the attachment without affecting the original bolt.
2Reliability
If the mushroom head diameter is increased to improve prying resistance, then security is improved, but the leverage acting on the shaft increases making it easier to pry open
Solution Approach 1:
The attachment transitions the locking mechanism from a cylindrical shape to a cuboid form. The tongue extends perpendicular to the bolt's axis of movement, creating a L-shaped configuration. This dimensional change allows the locking interface to engage in multiple directions (vertically and horizontally), distributing prying forces more effectively and preventing simple leveraging attacks.
Solution Approach 2:
The attachment is installed beforehand on the existing locking bolt, creating a pre-assembled unit with enhanced geometry. The L-shaped tongue is pre-positioned to engage with the strike plate, so that when installation occurs, the improved prying resistance is immediately active without requiring additional adjustment or modification during the locking process.
3Ease of manufacture
If existing roller or bolt locking systems are used, then ease of retrofitting is maintained, but resistance against prying is insufficient
Solution Approach 1:
The attachment is designed with a blind hole that can accommodate multiple types of locking bolts (roller, standard bolt, or mushroom-headed bolt). The universal design allows the same attachment to be retrofitted onto different existing locking mechanisms, providing enhanced security across various window and door types without requiring different attachment designs.
Data Source
Figure 1a~5
Figure 6~7
AI summary
The present invention relates to a locking system for windows and doors for retrofitting with an attachment for the existing rolling, locking or mushroom head pin and a closing piece in exchange for the existing closing piece. The attachment is provided with a tongue which, in the locking position, engages into a receiving pocket in the closing piece. Furthermore, the invention relates to a window or a door with improved protection against forced opening, in which at least one locking system according to the invention is installed, and to a method for retrofitting a window or a door with the locking system according to the invention.